7th grade football

whats up guys. my son is 13 years old on the football team. he has some of the best natural athletic ability on the team but he's just too thin. he's 5 ft 85 lb's soaking wet. i preach to him that to be one of the best he's gotta get solid. any other guys here around that age with some tips? i'm trying to get him to be a gym rat like his dad..

thx guys. i basically have him doing bench deads and squats right now. im just teaching him the fundamentals of each position right now while we see wht his lifts do for him over the course of 1 yr up until 8th grade. id like 4 him to set a goal to get to 110 by next season